I am considering buying an A → B → A round-trip ticket from Air France with a very tight timing: the onward flight would arrive on a Monday, and I would need to return immediately on Tuesday.
Suppose the onward flight on Monday gets cancelled, or severely delayed, and thus I miss the return flight on Tuesday. It is not likely to happen, but entirely possible. Would Air France still get me back to city A at no extra cost?
If this were a ticket from X to Y with transfer through Z, and I missed the Z → Y leg due a delay on the X → Z one, then they would get me to the destination. But the situation I am asking about is different because it concerns a return flight, not a single trip with transfer. The onward and return parts are purchased together though (buying them separately would cost more).